Insulating material.



UNITED STATES PATENT OFFICE.

EUGENE A. MERRILL, OF GRAND RAPIDS, MICHIGAN, ASSIGNOR OF ONE-HALE T0 GRAND RAPIDS FIRELESS COOKSTOVE COMPANY, OF GRAND RAPIDS, MICHIGAN.

INSULATING MATERIAL.

PatentedSept. 19, 1911.

1, 1909. Serial No. 505,402.

Specification of Letters Patent.

No Drawing. Application filed July To all whom it may concem:

Be it known that I, EUGENE A. MERRILL, a citizen of the United States, residing at Grandlt'apids, Michigan, have invented certain new and useful Improvements in Into char cork in its unmixed condition, the result will not be objectionable, because the particles or ieces of cork will be supported, even when s ightly charred.

improved insulating material is, as

sulating Material, of which the "following is stated, es ecially designed by me for the a specification. packing o the walls of the so-called fireless This invention relates to improvements in cookers, and the cork is so protected by the insulating material. asbestos that it is capable of withstanding In the manufacture of the so-called firethe highest tem ratures to which it is there less cookers, it is customary to provide likely to be su jected. Saw-dust or wood, double walls, and to fill the space between in the anular form, may be substituted for the walls with a packing material to prethe cor but cork is much superior to sawvent radiation of heat. dust. The yellow asbestos, which can be It is the main object of my present invenround ver fine, is found to be most satistion to provide an improved insulating actory, alt ough powdered or finely divided adapted for use where heat is to be resisted.

material for structures of this class, although 4 white asbestos produces my improved insulating material is well results.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

An insulating packing material consisting of a mixture of dry granular cork of relatively lar e granules with dry powdered asbestos filling in the interstices in the granular cork and substantially separating the granules of said 'cork, compacted together.

In witness whereof, I have hereunto set hand and seal in the presence of: two

quite satisfactory My improved insulating material consists ground cork, that is, cork reduced to granular form and owdered asbestos, the powdered ellow as estos being referred. The groun cork and dry powdere asbestos are so proportioned that the interstices in the ground cork are filled with the powdered asbestos so that each piece or particle of. cork is practically surrounde by the powdered asbestos, and is protected and supported by it. In use, this material is packed or tampeid into the spgcfe in a dry olr unwitnesses. moistene condition an orms an insu ating bod which is a very eifective non-conductor EUGENE MERRHJL' of eat or cold, and an insulating body Witnesses: which is filled with minute air chambers. CALVIN A. LAtizoN,

CATHERINE M. Prunes.

In the event of such a high temperature as 

